I am not sure that it adds to IQ, rather than it fills the brain with information that can be regurgitated. Kids seem smart because they can repeat things they have heard, but that is the skill of kids - they are sponges. However, when it comes to putting that into practice, it is a different matter.
I see that in childhood we get the chance to practice things, which means being active, not passive. Thinking we can, doesn't mean we can. The screens teach trivia, not application, and very few consumers will ever actually apply what they have learned.
My daughter for example doesn't know a lot of trivia, but she understands complex concepts and can discuss them, adding insight, and brings in real world examples from her life. It isn't genetic, it is just how we interact with her. She is included in conversations when we are eating, at the shops, driving along to the city. We spend time actually seeing each other's faces. I think it makes a difference in how we are able to judge situations later in life too. Many kids barely see a face directly these days.
I was listening to a podcast the other day about complicated problems and complex problems. Complicated problems can be difficult to solve, but once they are solved, the solution can be replicated easily. Complex problems are those that have many variables that keep changing and shifting, and are impossible to solve perfectly.
The IQ of humans is complicated. A fulfilled life is complex.
AI is already better at many things than the average human, and string multiple narrow AIs together, and most humans can't compete at all. They aren't very good company in bed though, and they don't give a nice massage. They also don't feel joy when we make them laugh.
If our IQ can be replaced, what value can we bring to the table of humanity?